Sandbox payment not working - undocumented error code

Questions
2

Hi @warrenspencer1977 welcome to the Square developer community :).

The issue seems to be that null is provided for amount_money. Can you retry the sandbox API request with values for currency and amount within the amount_money object. Here’s an example:

"amount_money": {
      "currency": "USD",
      "amount": 1000
    }

Here’s a link to the Payment API documentation with more information on fields required in the request: POST /v2/payments - Square API Reference, hope this helps!